Importance

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Abstract

A blower having an axial fan driven by a rotating drive source and enclosed by a shroud assembly including a substantially cylindrical fan shroud enclosing an outer circumference of the axial fan, and a protective unit provided with a plurality of support beams extending from the fan shroud toward an air intake side of the blower and cooperating with a plurality of ring-like members so as to form a protective net member for preventing entrance of any unfavorable substances such as foreign matter or a human finger into the shroud assembly, and a plurality of support ribs operating as a physical rib members and as protective members preventing entrance of the unfavorable substances from a radially outer region of the blower into the interior of the shroud assembly. The support ribs are arranged so as to provide a large spacing between the ribs and the outer circumference of the axial fan to thereby reduce generation of turbulence of the intake air resulting in a lowering of the hissing or whistling sound of the air flowing across the support ribs and through the axial fan.

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First Claim